Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2001-2003 Sistina Software (UK) Limited. |
| 3 | * |
| 4 | * This file is released under the GPL. |
| 5 | */ |
| 6 | |
Mike Snitzer | 7fff5e8 | 2013-09-06 11:36:01 -0400 | [diff] [blame] | 7 | #include "dm.h" |
Mikulas Patocka | 586e80e | 2008-10-21 17:44:59 +0100 | [diff] [blame] | 8 | #include <linux/device-mapper.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/blkdev.h> |
| 13 | #include <linux/bio.h> |
Dan Williams | 817bf40 | 2017-04-12 13:37:44 -0700 | [diff] [blame] | 14 | #include <linux/dax.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/slab.h> |
vignesh babu | 6f3c3f0 | 2007-10-19 22:38:44 +0100 | [diff] [blame] | 16 | #include <linux/log2.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 18 | #define DM_MSG_PREFIX "striped" |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 19 | #define DM_IO_ERROR_THRESHOLD 15 |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 20 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | struct stripe { |
| 22 | struct dm_dev *dev; |
| 23 | sector_t physical_start; |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 24 | |
| 25 | atomic_t error_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | }; |
| 27 | |
| 28 | struct stripe_c { |
| 29 | uint32_t stripes; |
Mikulas Patocka | c96053b | 2010-08-12 04:14:21 +0100 | [diff] [blame] | 30 | int stripes_shift; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | /* The size of this target / num. stripes */ |
| 33 | sector_t stripe_width; |
| 34 | |
Mike Snitzer | eb850de | 2012-07-27 15:08:01 +0100 | [diff] [blame] | 35 | uint32_t chunk_size; |
Mikulas Patocka | 33d07c0 | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 36 | int chunk_size_shift; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 38 | /* Needed for handling events */ |
| 39 | struct dm_target *ti; |
| 40 | |
| 41 | /* Work struct used for triggering events*/ |
Tejun Heo | f521f07 | 2011-01-13 19:59:57 +0000 | [diff] [blame] | 42 | struct work_struct trigger_event; |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 43 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | struct stripe stripe[0]; |
| 45 | }; |
| 46 | |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 47 | /* |
| 48 | * An event is triggered whenever a drive |
| 49 | * drops out of a stripe volume. |
| 50 | */ |
| 51 | static void trigger_event(struct work_struct *work) |
| 52 | { |
Tejun Heo | f521f07 | 2011-01-13 19:59:57 +0000 | [diff] [blame] | 53 | struct stripe_c *sc = container_of(work, struct stripe_c, |
| 54 | trigger_event); |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 55 | dm_table_event(sc->ti->table); |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 56 | } |
| 57 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | static inline struct stripe_c *alloc_context(unsigned int stripes) |
| 59 | { |
| 60 | size_t len; |
| 61 | |
Mikulas Patocka | d63a5ce | 2008-10-21 17:44:57 +0100 | [diff] [blame] | 62 | if (dm_array_too_big(sizeof(struct stripe_c), sizeof(struct stripe), |
| 63 | stripes)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | return NULL; |
| 65 | |
| 66 | len = sizeof(struct stripe_c) + (sizeof(struct stripe) * stripes); |
| 67 | |
| 68 | return kmalloc(len, GFP_KERNEL); |
| 69 | } |
| 70 | |
| 71 | /* |
| 72 | * Parse a single <dev> <sector> pair |
| 73 | */ |
| 74 | static int get_stripe(struct dm_target *ti, struct stripe_c *sc, |
| 75 | unsigned int stripe, char **argv) |
| 76 | { |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 77 | unsigned long long start; |
Mikulas Patocka | 31998ef | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 78 | char dummy; |
Vivek Goyal | e80d1c8 | 2015-07-31 09:20:36 -0400 | [diff] [blame] | 79 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
Mikulas Patocka | 31998ef | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 81 | if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | return -EINVAL; |
| 83 | |
Vivek Goyal | e80d1c8 | 2015-07-31 09:20:36 -0400 | [diff] [blame] | 84 | ret = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), |
| 85 | &sc->stripe[stripe].dev); |
| 86 | if (ret) |
| 87 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
| 89 | sc->stripe[stripe].physical_start = start; |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | /* |
| 95 | * Construct a striped mapping. |
Mike Snitzer | eb850de | 2012-07-27 15:08:01 +0100 | [diff] [blame] | 96 | * <number of stripes> <chunk size> [<dev_path> <offset>]+ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | */ |
| 98 | static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv) |
| 99 | { |
| 100 | struct stripe_c *sc; |
Mike Snitzer | d793e684 | 2013-05-10 14:37:14 +0100 | [diff] [blame] | 101 | sector_t width, tmp_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | uint32_t stripes; |
| 103 | uint32_t chunk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | int r; |
| 105 | unsigned int i; |
| 106 | |
| 107 | if (argc < 2) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 108 | ti->error = "Not enough arguments"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | return -EINVAL; |
| 110 | } |
| 111 | |
majianpeng | 1a66a08 | 2012-07-27 15:07:59 +0100 | [diff] [blame] | 112 | if (kstrtouint(argv[0], 10, &stripes) || !stripes) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 113 | ti->error = "Invalid stripe count"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | return -EINVAL; |
| 115 | } |
| 116 | |
Mikulas Patocka | 8f069b4 | 2012-07-27 15:08:01 +0100 | [diff] [blame] | 117 | if (kstrtouint(argv[1], 10, &chunk_size) || !chunk_size) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 118 | ti->error = "Invalid chunk_size"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | return -EINVAL; |
| 120 | } |
| 121 | |
Mike Snitzer | eb850de | 2012-07-27 15:08:01 +0100 | [diff] [blame] | 122 | width = ti->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | if (sector_div(width, stripes)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 124 | ti->error = "Target length not divisible by " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | "number of stripes"; |
| 126 | return -EINVAL; |
| 127 | } |
| 128 | |
Mike Snitzer | d793e684 | 2013-05-10 14:37:14 +0100 | [diff] [blame] | 129 | tmp_len = width; |
| 130 | if (sector_div(tmp_len, chunk_size)) { |
| 131 | ti->error = "Target length not divisible by " |
| 132 | "chunk size"; |
| 133 | return -EINVAL; |
| 134 | } |
| 135 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | /* |
| 137 | * Do we have enough arguments for that many stripes ? |
| 138 | */ |
| 139 | if (argc != (2 + 2 * stripes)) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 140 | ti->error = "Not enough destinations " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | "specified"; |
| 142 | return -EINVAL; |
| 143 | } |
| 144 | |
| 145 | sc = alloc_context(stripes); |
| 146 | if (!sc) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 147 | ti->error = "Memory allocation for striped context " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | "failed"; |
| 149 | return -ENOMEM; |
| 150 | } |
| 151 | |
Tejun Heo | f521f07 | 2011-01-13 19:59:57 +0000 | [diff] [blame] | 152 | INIT_WORK(&sc->trigger_event, trigger_event); |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 153 | |
| 154 | /* Set pointer to dm target; used in trigger_event */ |
| 155 | sc->ti = ti; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | sc->stripes = stripes; |
| 157 | sc->stripe_width = width; |
Mikulas Patocka | c96053b | 2010-08-12 04:14:21 +0100 | [diff] [blame] | 158 | |
| 159 | if (stripes & (stripes - 1)) |
| 160 | sc->stripes_shift = -1; |
Mikulas Patocka | 1df0548 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 161 | else |
| 162 | sc->stripes_shift = __ffs(stripes); |
Mikulas Patocka | c96053b | 2010-08-12 04:14:21 +0100 | [diff] [blame] | 163 | |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 164 | r = dm_set_target_max_io_len(ti, chunk_size); |
Pavitra Kumar | a3f2af2 | 2014-10-10 15:19:46 +0000 | [diff] [blame] | 165 | if (r) { |
| 166 | kfree(sc); |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 167 | return r; |
Pavitra Kumar | a3f2af2 | 2014-10-10 15:19:46 +0000 | [diff] [blame] | 168 | } |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 169 | |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 170 | ti->num_flush_bios = stripes; |
| 171 | ti->num_discard_bios = stripes; |
| 172 | ti->num_write_same_bios = stripes; |
Christoph Hellwig | ac62d62 | 2017-04-05 19:21:05 +0200 | [diff] [blame] | 173 | ti->num_write_zeroes_bios = stripes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | |
Mike Snitzer | eb850de | 2012-07-27 15:08:01 +0100 | [diff] [blame] | 175 | sc->chunk_size = chunk_size; |
Mikulas Patocka | 33d07c0 | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 176 | if (chunk_size & (chunk_size - 1)) |
| 177 | sc->chunk_size_shift = -1; |
| 178 | else |
| 179 | sc->chunk_size_shift = __ffs(chunk_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
| 181 | /* |
| 182 | * Get the stripe destinations. |
| 183 | */ |
| 184 | for (i = 0; i < stripes; i++) { |
| 185 | argv += 2; |
| 186 | |
| 187 | r = get_stripe(ti, sc, i, argv); |
| 188 | if (r < 0) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 189 | ti->error = "Couldn't parse stripe destination"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | while (i--) |
| 191 | dm_put_device(ti, sc->stripe[i].dev); |
| 192 | kfree(sc); |
| 193 | return r; |
| 194 | } |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 195 | atomic_set(&(sc->stripe[i].error_count), 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | } |
| 197 | |
| 198 | ti->private = sc; |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 199 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | static void stripe_dtr(struct dm_target *ti) |
| 204 | { |
| 205 | unsigned int i; |
| 206 | struct stripe_c *sc = (struct stripe_c *) ti->private; |
| 207 | |
| 208 | for (i = 0; i < sc->stripes; i++) |
| 209 | dm_put_device(ti, sc->stripe[i].dev); |
| 210 | |
Tejun Heo | 4382973 | 2012-08-20 14:51:24 -0700 | [diff] [blame] | 211 | flush_work(&sc->trigger_event); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | kfree(sc); |
| 213 | } |
| 214 | |
Mikulas Patocka | 6598852 | 2010-08-12 04:14:14 +0100 | [diff] [blame] | 215 | static void stripe_map_sector(struct stripe_c *sc, sector_t sector, |
| 216 | uint32_t *stripe, sector_t *result) |
| 217 | { |
Mike Snitzer | eb850de | 2012-07-27 15:08:01 +0100 | [diff] [blame] | 218 | sector_t chunk = dm_target_offset(sc->ti, sector); |
Mikulas Patocka | 33d07c0 | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 219 | sector_t chunk_offset; |
| 220 | |
| 221 | if (sc->chunk_size_shift < 0) |
| 222 | chunk_offset = sector_div(chunk, sc->chunk_size); |
| 223 | else { |
| 224 | chunk_offset = chunk & (sc->chunk_size - 1); |
| 225 | chunk >>= sc->chunk_size_shift; |
| 226 | } |
Mikulas Patocka | 6598852 | 2010-08-12 04:14:14 +0100 | [diff] [blame] | 227 | |
Mikulas Patocka | c96053b | 2010-08-12 04:14:21 +0100 | [diff] [blame] | 228 | if (sc->stripes_shift < 0) |
| 229 | *stripe = sector_div(chunk, sc->stripes); |
| 230 | else { |
Mikulas Patocka | 1df0548 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 231 | *stripe = chunk & (sc->stripes - 1); |
Mikulas Patocka | c96053b | 2010-08-12 04:14:21 +0100 | [diff] [blame] | 232 | chunk >>= sc->stripes_shift; |
| 233 | } |
| 234 | |
Mikulas Patocka | 33d07c0 | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 235 | if (sc->chunk_size_shift < 0) |
| 236 | chunk *= sc->chunk_size; |
| 237 | else |
| 238 | chunk <<= sc->chunk_size_shift; |
| 239 | |
| 240 | *result = chunk + chunk_offset; |
Mikulas Patocka | 6598852 | 2010-08-12 04:14:14 +0100 | [diff] [blame] | 241 | } |
| 242 | |
Mikulas Patocka | 7b76ec1 | 2010-08-12 04:14:26 +0100 | [diff] [blame] | 243 | static void stripe_map_range_sector(struct stripe_c *sc, sector_t sector, |
| 244 | uint32_t target_stripe, sector_t *result) |
| 245 | { |
| 246 | uint32_t stripe; |
| 247 | |
| 248 | stripe_map_sector(sc, sector, &stripe, result); |
| 249 | if (stripe == target_stripe) |
| 250 | return; |
Mike Snitzer | eb850de | 2012-07-27 15:08:01 +0100 | [diff] [blame] | 251 | |
| 252 | /* round down */ |
| 253 | sector = *result; |
Mikulas Patocka | 33d07c0 | 2012-07-27 15:08:02 +0100 | [diff] [blame] | 254 | if (sc->chunk_size_shift < 0) |
| 255 | *result -= sector_div(sector, sc->chunk_size); |
| 256 | else |
| 257 | *result = sector & ~(sector_t)(sc->chunk_size - 1); |
Mike Snitzer | eb850de | 2012-07-27 15:08:01 +0100 | [diff] [blame] | 258 | |
Mikulas Patocka | 7b76ec1 | 2010-08-12 04:14:26 +0100 | [diff] [blame] | 259 | if (target_stripe < stripe) |
Mike Snitzer | eb850de | 2012-07-27 15:08:01 +0100 | [diff] [blame] | 260 | *result += sc->chunk_size; /* next chunk */ |
Mikulas Patocka | 7b76ec1 | 2010-08-12 04:14:26 +0100 | [diff] [blame] | 261 | } |
| 262 | |
Mike Snitzer | 45e621d | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 263 | static int stripe_map_range(struct stripe_c *sc, struct bio *bio, |
| 264 | uint32_t target_stripe) |
Mikulas Patocka | 7b76ec1 | 2010-08-12 04:14:26 +0100 | [diff] [blame] | 265 | { |
| 266 | sector_t begin, end; |
| 267 | |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 268 | stripe_map_range_sector(sc, bio->bi_iter.bi_sector, |
| 269 | target_stripe, &begin); |
Kent Overstreet | f73a1c7 | 2012-09-25 15:05:12 -0700 | [diff] [blame] | 270 | stripe_map_range_sector(sc, bio_end_sector(bio), |
Mikulas Patocka | 7b76ec1 | 2010-08-12 04:14:26 +0100 | [diff] [blame] | 271 | target_stripe, &end); |
| 272 | if (begin < end) { |
Christoph Hellwig | 74d4699 | 2017-08-23 19:10:32 +0200 | [diff] [blame] | 273 | bio_set_dev(bio, sc->stripe[target_stripe].dev->bdev); |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 274 | bio->bi_iter.bi_sector = begin + |
| 275 | sc->stripe[target_stripe].physical_start; |
| 276 | bio->bi_iter.bi_size = to_bytes(end - begin); |
Mikulas Patocka | 7b76ec1 | 2010-08-12 04:14:26 +0100 | [diff] [blame] | 277 | return DM_MAPIO_REMAPPED; |
| 278 | } else { |
| 279 | /* The range doesn't map to the target stripe */ |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 280 | bio_endio(bio); |
Mikulas Patocka | 7b76ec1 | 2010-08-12 04:14:26 +0100 | [diff] [blame] | 281 | return DM_MAPIO_SUBMITTED; |
| 282 | } |
| 283 | } |
| 284 | |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 285 | static int stripe_map(struct dm_target *ti, struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | { |
Mikulas Patocka | 6598852 | 2010-08-12 04:14:14 +0100 | [diff] [blame] | 287 | struct stripe_c *sc = ti->private; |
Mikulas Patocka | 374bf7e | 2009-06-22 10:12:22 +0100 | [diff] [blame] | 288 | uint32_t stripe; |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 289 | unsigned target_bio_nr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
Jens Axboe | 1eff9d3 | 2016-08-05 15:35:16 -0600 | [diff] [blame] | 291 | if (bio->bi_opf & REQ_PREFLUSH) { |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 292 | target_bio_nr = dm_bio_get_target_bio_nr(bio); |
| 293 | BUG_ON(target_bio_nr >= sc->stripes); |
Christoph Hellwig | 74d4699 | 2017-08-23 19:10:32 +0200 | [diff] [blame] | 294 | bio_set_dev(bio, sc->stripe[target_bio_nr].dev->bdev); |
Mikulas Patocka | 374bf7e | 2009-06-22 10:12:22 +0100 | [diff] [blame] | 295 | return DM_MAPIO_REMAPPED; |
| 296 | } |
Mike Christie | e604714 | 2016-06-05 14:32:04 -0500 | [diff] [blame] | 297 | if (unlikely(bio_op(bio) == REQ_OP_DISCARD) || |
Christoph Hellwig | ac62d62 | 2017-04-05 19:21:05 +0200 | [diff] [blame] | 298 | unlikely(bio_op(bio) == REQ_OP_WRITE_ZEROES) || |
Mike Christie | e604714 | 2016-06-05 14:32:04 -0500 | [diff] [blame] | 299 | unlikely(bio_op(bio) == REQ_OP_WRITE_SAME)) { |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 300 | target_bio_nr = dm_bio_get_target_bio_nr(bio); |
| 301 | BUG_ON(target_bio_nr >= sc->stripes); |
| 302 | return stripe_map_range(sc, bio, target_bio_nr); |
Mikulas Patocka | 7b76ec1 | 2010-08-12 04:14:26 +0100 | [diff] [blame] | 303 | } |
Mikulas Patocka | 374bf7e | 2009-06-22 10:12:22 +0100 | [diff] [blame] | 304 | |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 305 | stripe_map_sector(sc, bio->bi_iter.bi_sector, |
| 306 | &stripe, &bio->bi_iter.bi_sector); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 308 | bio->bi_iter.bi_sector += sc->stripe[stripe].physical_start; |
Christoph Hellwig | 74d4699 | 2017-08-23 19:10:32 +0200 | [diff] [blame] | 309 | bio_set_dev(bio, sc->stripe[stripe].dev->bdev); |
Mikulas Patocka | 6598852 | 2010-08-12 04:14:14 +0100 | [diff] [blame] | 310 | |
Kiyoshi Ueda | d2a7ad2 | 2006-12-08 02:41:06 -0800 | [diff] [blame] | 311 | return DM_MAPIO_REMAPPED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | } |
| 313 | |
Dan Williams | 817bf40 | 2017-04-12 13:37:44 -0700 | [diff] [blame] | 314 | static long stripe_dax_direct_access(struct dm_target *ti, pgoff_t pgoff, |
| 315 | long nr_pages, void **kaddr, pfn_t *pfn) |
Toshi Kani | beec25b | 2016-06-24 12:23:30 -0600 | [diff] [blame] | 316 | { |
Dan Williams | 817bf40 | 2017-04-12 13:37:44 -0700 | [diff] [blame] | 317 | sector_t dev_sector, sector = pgoff * PAGE_SECTORS; |
Toshi Kani | beec25b | 2016-06-24 12:23:30 -0600 | [diff] [blame] | 318 | struct stripe_c *sc = ti->private; |
Dan Williams | 817bf40 | 2017-04-12 13:37:44 -0700 | [diff] [blame] | 319 | struct dax_device *dax_dev; |
Toshi Kani | beec25b | 2016-06-24 12:23:30 -0600 | [diff] [blame] | 320 | struct block_device *bdev; |
Dan Williams | 817bf40 | 2017-04-12 13:37:44 -0700 | [diff] [blame] | 321 | uint32_t stripe; |
Toshi Kani | beec25b | 2016-06-24 12:23:30 -0600 | [diff] [blame] | 322 | long ret; |
| 323 | |
Dan Williams | 817bf40 | 2017-04-12 13:37:44 -0700 | [diff] [blame] | 324 | stripe_map_sector(sc, sector, &stripe, &dev_sector); |
| 325 | dev_sector += sc->stripe[stripe].physical_start; |
| 326 | dax_dev = sc->stripe[stripe].dev->dax_dev; |
Toshi Kani | beec25b | 2016-06-24 12:23:30 -0600 | [diff] [blame] | 327 | bdev = sc->stripe[stripe].dev->bdev; |
| 328 | |
Dan Williams | 817bf40 | 2017-04-12 13:37:44 -0700 | [diff] [blame] | 329 | ret = bdev_dax_pgoff(bdev, dev_sector, nr_pages * PAGE_SIZE, &pgoff); |
| 330 | if (ret) |
| 331 | return ret; |
| 332 | return dax_direct_access(dax_dev, pgoff, nr_pages, kaddr, pfn); |
Toshi Kani | beec25b | 2016-06-24 12:23:30 -0600 | [diff] [blame] | 333 | } |
| 334 | |
Dan Williams | 7e026c8 | 2017-05-29 12:57:56 -0700 | [diff] [blame] | 335 | static size_t stripe_dax_copy_from_iter(struct dm_target *ti, pgoff_t pgoff, |
| 336 | void *addr, size_t bytes, struct iov_iter *i) |
| 337 | { |
| 338 | sector_t dev_sector, sector = pgoff * PAGE_SECTORS; |
| 339 | struct stripe_c *sc = ti->private; |
| 340 | struct dax_device *dax_dev; |
| 341 | struct block_device *bdev; |
| 342 | uint32_t stripe; |
| 343 | |
| 344 | stripe_map_sector(sc, sector, &stripe, &dev_sector); |
| 345 | dev_sector += sc->stripe[stripe].physical_start; |
| 346 | dax_dev = sc->stripe[stripe].dev->dax_dev; |
| 347 | bdev = sc->stripe[stripe].dev->bdev; |
| 348 | |
| 349 | if (bdev_dax_pgoff(bdev, dev_sector, ALIGN(bytes, PAGE_SIZE), &pgoff)) |
| 350 | return 0; |
| 351 | return dax_copy_from_iter(dax_dev, pgoff, addr, bytes, i); |
| 352 | } |
| 353 | |
Brian Wood | 4f7f5c6 | 2008-02-08 02:11:24 +0000 | [diff] [blame] | 354 | /* |
| 355 | * Stripe status: |
| 356 | * |
| 357 | * INFO |
| 358 | * #stripes [stripe_name <stripe_name>] [group word count] |
| 359 | * [error count 'A|D' <error count 'A|D'>] |
| 360 | * |
| 361 | * TABLE |
| 362 | * #stripes [stripe chunk size] |
| 363 | * [stripe_name physical_start <stripe_name physical_start>] |
| 364 | * |
| 365 | */ |
| 366 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 367 | static void stripe_status(struct dm_target *ti, status_type_t type, |
| 368 | unsigned status_flags, char *result, unsigned maxlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | { |
| 370 | struct stripe_c *sc = (struct stripe_c *) ti->private; |
Brian Wood | 4f7f5c6 | 2008-02-08 02:11:24 +0000 | [diff] [blame] | 371 | char buffer[sc->stripes + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | unsigned int sz = 0; |
| 373 | unsigned int i; |
| 374 | |
| 375 | switch (type) { |
| 376 | case STATUSTYPE_INFO: |
Brian Wood | 4f7f5c6 | 2008-02-08 02:11:24 +0000 | [diff] [blame] | 377 | DMEMIT("%d ", sc->stripes); |
| 378 | for (i = 0; i < sc->stripes; i++) { |
| 379 | DMEMIT("%s ", sc->stripe[i].dev->name); |
| 380 | buffer[i] = atomic_read(&(sc->stripe[i].error_count)) ? |
| 381 | 'D' : 'A'; |
| 382 | } |
| 383 | buffer[i] = '\0'; |
| 384 | DMEMIT("1 %s", buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | break; |
| 386 | |
| 387 | case STATUSTYPE_TABLE: |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 388 | DMEMIT("%d %llu", sc->stripes, |
Mike Snitzer | eb850de | 2012-07-27 15:08:01 +0100 | [diff] [blame] | 389 | (unsigned long long)sc->chunk_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | for (i = 0; i < sc->stripes; i++) |
Andrew Morton | 4ee218c | 2006-03-27 01:17:48 -0800 | [diff] [blame] | 391 | DMEMIT(" %s %llu", sc->stripe[i].dev->name, |
| 392 | (unsigned long long)sc->stripe[i].physical_start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | break; |
| 394 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | } |
| 396 | |
Christoph Hellwig | 4e4cbee | 2017-06-03 09:38:06 +0200 | [diff] [blame] | 397 | static int stripe_end_io(struct dm_target *ti, struct bio *bio, |
| 398 | blk_status_t *error) |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 399 | { |
| 400 | unsigned i; |
| 401 | char major_minor[16]; |
| 402 | struct stripe_c *sc = ti->private; |
| 403 | |
Christoph Hellwig | 1be5690 | 2017-06-03 09:38:03 +0200 | [diff] [blame] | 404 | if (!*error) |
| 405 | return DM_ENDIO_DONE; /* I/O complete */ |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 406 | |
Christoph Hellwig | 9966afa | 2017-06-03 09:37:57 +0200 | [diff] [blame] | 407 | if (bio->bi_opf & REQ_RAHEAD) |
Christoph Hellwig | 1be5690 | 2017-06-03 09:38:03 +0200 | [diff] [blame] | 408 | return DM_ENDIO_DONE; |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 409 | |
Christoph Hellwig | 4e4cbee | 2017-06-03 09:38:06 +0200 | [diff] [blame] | 410 | if (*error == BLK_STS_NOTSUPP) |
Christoph Hellwig | 1be5690 | 2017-06-03 09:38:03 +0200 | [diff] [blame] | 411 | return DM_ENDIO_DONE; |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 412 | |
| 413 | memset(major_minor, 0, sizeof(major_minor)); |
Christoph Hellwig | 74d4699 | 2017-08-23 19:10:32 +0200 | [diff] [blame] | 414 | sprintf(major_minor, "%d:%d", MAJOR(bio_dev(bio)), MINOR(bio_dev(bio))); |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 415 | |
| 416 | /* |
| 417 | * Test to see which stripe drive triggered the event |
| 418 | * and increment error count for all stripes on that device. |
| 419 | * If the error count for a given device exceeds the threshold |
| 420 | * value we will no longer trigger any further events. |
| 421 | */ |
| 422 | for (i = 0; i < sc->stripes; i++) |
| 423 | if (!strcmp(sc->stripe[i].dev->name, major_minor)) { |
| 424 | atomic_inc(&(sc->stripe[i].error_count)); |
| 425 | if (atomic_read(&(sc->stripe[i].error_count)) < |
| 426 | DM_IO_ERROR_THRESHOLD) |
Tejun Heo | f521f07 | 2011-01-13 19:59:57 +0000 | [diff] [blame] | 427 | schedule_work(&sc->trigger_event); |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 428 | } |
| 429 | |
Christoph Hellwig | 1be5690 | 2017-06-03 09:38:03 +0200 | [diff] [blame] | 430 | return DM_ENDIO_DONE; |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 431 | } |
| 432 | |
Mike Snitzer | af4874e | 2009-06-22 10:12:33 +0100 | [diff] [blame] | 433 | static int stripe_iterate_devices(struct dm_target *ti, |
| 434 | iterate_devices_callout_fn fn, void *data) |
| 435 | { |
| 436 | struct stripe_c *sc = ti->private; |
| 437 | int ret = 0; |
| 438 | unsigned i = 0; |
| 439 | |
Mike Snitzer | 5dea271 | 2009-07-23 20:30:42 +0100 | [diff] [blame] | 440 | do { |
Mike Snitzer | af4874e | 2009-06-22 10:12:33 +0100 | [diff] [blame] | 441 | ret = fn(ti, sc->stripe[i].dev, |
Mike Snitzer | 5dea271 | 2009-07-23 20:30:42 +0100 | [diff] [blame] | 442 | sc->stripe[i].physical_start, |
| 443 | sc->stripe_width, data); |
| 444 | } while (!ret && ++i < sc->stripes); |
Mike Snitzer | af4874e | 2009-06-22 10:12:33 +0100 | [diff] [blame] | 445 | |
| 446 | return ret; |
| 447 | } |
| 448 | |
Mike Snitzer | 40bea43 | 2009-09-04 20:40:25 +0100 | [diff] [blame] | 449 | static void stripe_io_hints(struct dm_target *ti, |
| 450 | struct queue_limits *limits) |
| 451 | { |
| 452 | struct stripe_c *sc = ti->private; |
Mike Snitzer | eb850de | 2012-07-27 15:08:01 +0100 | [diff] [blame] | 453 | unsigned chunk_size = sc->chunk_size << SECTOR_SHIFT; |
Mike Snitzer | 40bea43 | 2009-09-04 20:40:25 +0100 | [diff] [blame] | 454 | |
| 455 | blk_limits_io_min(limits, chunk_size); |
Martin K. Petersen | 3c5820c | 2009-09-11 21:54:52 +0200 | [diff] [blame] | 456 | blk_limits_io_opt(limits, chunk_size * sc->stripes); |
Mike Snitzer | 40bea43 | 2009-09-04 20:40:25 +0100 | [diff] [blame] | 457 | } |
| 458 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | static struct target_type stripe_target = { |
| 460 | .name = "striped", |
Toshi Kani | beec25b | 2016-06-24 12:23:30 -0600 | [diff] [blame] | 461 | .version = {1, 6, 0}, |
Mikulas Patocka | e2460f2 | 2017-04-18 16:51:48 -0400 | [diff] [blame] | 462 | .features = DM_TARGET_PASSES_INTEGRITY, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | .module = THIS_MODULE, |
| 464 | .ctr = stripe_ctr, |
| 465 | .dtr = stripe_dtr, |
| 466 | .map = stripe_map, |
Brian Wood | a25eb94 | 2008-02-08 02:11:22 +0000 | [diff] [blame] | 467 | .end_io = stripe_end_io, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | .status = stripe_status, |
Mike Snitzer | af4874e | 2009-06-22 10:12:33 +0100 | [diff] [blame] | 469 | .iterate_devices = stripe_iterate_devices, |
Mike Snitzer | 40bea43 | 2009-09-04 20:40:25 +0100 | [diff] [blame] | 470 | .io_hints = stripe_io_hints, |
Dan Williams | 817bf40 | 2017-04-12 13:37:44 -0700 | [diff] [blame] | 471 | .direct_access = stripe_dax_direct_access, |
Dan Williams | 7e026c8 | 2017-05-29 12:57:56 -0700 | [diff] [blame] | 472 | .dax_copy_from_iter = stripe_dax_copy_from_iter, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | }; |
| 474 | |
| 475 | int __init dm_stripe_init(void) |
| 476 | { |
| 477 | int r; |
| 478 | |
| 479 | r = dm_register_target(&stripe_target); |
Luis Henriques | e223e1d | 2015-04-27 21:29:36 +0100 | [diff] [blame] | 480 | if (r < 0) |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 481 | DMWARN("target registration failed"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | |
| 483 | return r; |
| 484 | } |
| 485 | |
| 486 | void dm_stripe_exit(void) |
| 487 | { |
Mikulas Patocka | 10d3bd0 | 2009-01-06 03:04:58 +0000 | [diff] [blame] | 488 | dm_unregister_target(&stripe_target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | } |